/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.apache.groovy.groovysh.util

class SecurityManagerUtil {
    private final SecurityManager saved

    SecurityManagerUtil() {
        if (explicitlyEnabled() || autoEnabledUntilJDK17()) {
            saved = System.getSecurityManager()
            System.setSecurityManager(new NoExitSecurityManager())
        } else {
            saved = null;
        }
    }

    private static boolean autoEnabledUntilJDK17() {
        return Runtime.version().feature() < 18;
    }

    private static boolean explicitlyEnabled() {
        System.getProperty('java.security.manager', 'disallow') == 'allow'
    }

    void close() {
        System.setSecurityManager(saved)
    }
}
